how can i get flex_sdk_4.0.0.10485.zip?

2years ago,  i completed a project with flex_sdk_4.0.0.10485.zip.  today , i want to reuse the project , but i can't get the flex_sdk_4.0.0.10485.zip,  the source code can't complite correctly.   thank you !    the url "http://fpdownload.adobe.com/pub/flex/sdk/builds/flex4/flex_sdk_4.0.0.10485.zip"  is not avalible.